Paul Westaway wanted to make sure his woodstove didn’t exceed the upper limit of temperature and overheat, thus damaging the stove or causing a fire. He wanted a monitor that could send out an alert if the stove got too hot. He was surprised he couldn’t find a monitor available commercially. So, like any enterprising Gadget Freak, he decided to make one of his own. Using a handful of inexpensive components, Westaway created his own Woodstove Digital Temperature Monitor.
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Slightly more hackish approach of a similar situation: this coal stove tweets status updates.